Melanoma, the most deadly form of skin cancer, doesn’t usually occur in kids, but a new study shows that it’s happening more often.While melanoma in children is stillextremely rare, the rate increased by about 2 percent per year from 1973 to 2009 among U.S children from newborns to age 19. Melanoma accounts for up to 3 percent of all pediatric cancers, according to the Skin Cancer Foundation.According to the study, 1,317 children were diagnosed with melanoma during the study time frame. Of these, 1,230 children were white. Because the number of melanoma cases among other racial and ethnic groups was so small, researchers focused the analysis on white children. The biggest jump in melanoma rates was seen among adolescents aged 15 to 19, especially girls, the study showed.